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To: Andrew Pinski <pinskia@physics.uc.edu>
Cc: "S. Bosscher" <S.Bosscher@student.tudelft.nl>,
	"'paolo.bonzini@polimi.it '" <paolo.bonzini@polimi.it>,
	"'gcc@gcc.gnu.org '" <gcc@gcc.gnu.org>,
	"'kenner@vlsi1.ultra.nyu.edu '" <kenner@vlsi1.ultra.nyu.edu>,
	Michael Matz <matz@suse.de>
Subject: Re: What to remove after tree-ssa is merged?
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Andrew Pinski wrote:

> Should really PLACEHOLDER_EXPR be done in the front-end
> and be expanded to what it really does in gimplify stage
> which every other language needs to do with its language
> specific trees.

I don't think there is any clean translation here. Remember
that we tried this route energetically early on in Ada days
and failed, that is why PLACEHOLDER_EXPR was created to do
this task.

We really don't want that severe a mismatch between the
front end types and the back end types, a mismatch of that
level causes a lot of grief.

I am sure Richard can add more useful details here.